Pioneer DMH-C5500NEX Operation Manual page 63

Playback screen 2 (Radio mode)
Displays the hidden function bar.
TIP
You can also display the hidden function bar by flicking the bar from the left to the
right.
Gives a Thumbs Up to the playing track.
Gives a Thumbs Down to the playing track and skips to the next track.
NOTE
The number of tracks that are skipped varies depending on the application.
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